Python 如何从桌面文件获取Exec字段

如何从.desktop文件提取Exec字段。吉奥能帮我吗

#!/usr/bin/python2

import os
from gi.repository import Gio

launcher = Gio.DesktopAppInfo.new_from_filename('/usr/share/applications/chromium.desktop')
# how get Exec field from desktop file
# cat /usr/share/applications/chromium.desktop | grep ^Exec

#retval = launcher.launch_uris()

我完全是新手

print launcher.get_命令行